I reviewed the Bass Vector, Bass Vector Pro, and Beta Bass Processor back in the
Guitar World's Bass Guitar days. Here is a
link to that review.
I liked them pretty well, but told them that the cabs were too heavy for anyone who did not have roadies to use, so they came out with the Bass Vector 15 (which still sounds great, but is at least somewhat easier to move around).
These are nice cabs. I somewhat prefer my Berg IP's, but they cost a good bit more, and in truth, I could see some players preferring the ISP's to the Berg IP's.
Tom.